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The investigation revealed that a precice antegrade femur piriformis straight nail, 12.5mm x 305mm, appeared to have damage around the male-female junction site.The damage was believed to have occurred 2-weeks post-op, but the reporter cannot confirm this.It was reported that a revision procedure was completed with no adverse consequences to the patient.The nail was received by globus medical for investigation.A visual inspection was performed that confirmed that the nail had an approximate 7.5mm crack in the housing tube at the male-female junction.Additionally, one-half of the anti-rotation lug was missing while the other half remained in the housing tube.Functional testing was not performed as the missing anti-rotation lug would not allow the nail to properly function.The iqc inspection report for the lot of housing tube and anti-rotation lug used for the nail was reviewed, and the housing tube met all required specifications per the engineering drawing.Based on provided information, no event in particular had occurred which could have led to the nail breaking.However, based on the type of breakage observed, it is possible that the nail broke due to stress generated from weight bearing activities.A bending moment is created when weight bearing loads are placed on the distraction rod, causing stress along the housing tube portion where the crown is seated.The wall of the housing tube is thinnest at this location, causing a crack in the tube when enough stress is applied to that location.A review of the dhr documents indicates the device was manufactured by the specified requirement at the time and met all the required inspections before shipment.The associated risk document was reviewed, and the failure mode, effects, and harms potentially related to the reported event have been identified and mitigated.Furthermore, the complaint rate is within the estimated rate in the risk documentation associated with this product.Based on this risk assessment, no new or additional risk evaluation is necessary.
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